Expansion-drill.



No. 680,376. Patented Aug. l3, IBM.

J. FDRSYTHE.

EXPANSION DRILL.

l'ApplirM-ion filed Aug. 3, 1900.\-

(No Model.)

ZJW K 2 UNITED STATES PATENT @EFICE.

JAMES FORSYTHE, OF ONSLOW, IOWA.

EXPANSION-DRILL.

SPECIFICATION forming part of Letters Patent No. 680,37 6, dated August 13, 1901.

Application filed August 3, 1900- Serial No. 25,828. (No model.)

To all whom/ it may concern:

Be it known that 1, JAMES FORSYTHE, a citizen of the United States, residing at Onslow, in the county of Jones and State of Iowa, have invented a new and useful Expansion- Drill, of which the following is a specification.

This invention relates to a novel expansion-drill of that class which comprehends the employment of a supplemental or reaming bit expansibly carried by the drill bit or stock and designed when the latter has been passed below the end of the well tube or casing to expand for the purpose of reaming or counterboring the opening made by the cutting edge of the drill proper.

The object of the invention is to provide the drill-stock with an expanding bit of peculiar form calculated to increase the efficiency of its operation and mounted in a manner to preclude the possibility of its accidental derangement or release from the stock, said mounting being arranged with special reference to the easy removal of the bit for the purpose of facilitating repair or the replacement of the bit when no longer serviceable.

To the accomplishment of this object and others subordinate thereto, as will hereinafter more fully appear, the invention consists in the construction and arrangement of parts hereinafter more fully described, illustrated in the accompanying drawings, and succinctly defined in the appended claims.

In said drawings, Figure 1 is a sectional View through a well-casing, showing the drill located therein and illustrating in dotted lines the position assumed by the expanding drill-bit when the latter has been passed'below the lower end of the tube or casing. Fig. 2 is a side elevation of the drill complete. Fig. 3 is a sectional view on the line 3 3 of Fig. 2. Fig. 4 is a sectional view on the line 4 4 of Fig. 2. Fig. 5 is an end view of the expanding or supplemental bit. Fig. 6 is a side elevation of the main or primary drill bit or stock detached from the elements which are connected thereto in use, and Fig. 7 is an end view of the primary drill-bit.

Referring to the numerals of reference designating corresponding parts throughout the views, 1 indicates the body or stock of the drill,provided at its upper end with a threaded projection 2 for the attachment of the shank 3 and having its lower end formed with a cutting edge 4, which constitutes the main or primary bit of the drill. This cutting edge 4 is substantially of Z form, comprising a pair of arcuate cutting edges 4 and 4", connected by a diagonal rectilinear cutting edge 4, extending between the opposite ends of the arcuate edges 4 and 4".

The stock or body 1 is given a general contour in accordance with theindividual tastes of the manufacturer, but is preferably flat tened somewhat and slightly flared toward its lower end. At the longitudinal center of the stock is formed'an elongated slot 5, widened at one side face of the stock to form shoulderdefining recesses 6 for the reception of a transverse stop-flange 7, formed along one longitudinal edge of the web 8 of the supplemental or expanding bit 9. The web 8 is passed through the slot 5 and is formed at its edge opposite the flange 7 with a bit 10, disposed transverse to the web and extending beyond the opposite sides thereof. The lower end of the bit- 10 is formed with an arcuate cutting edge 11, bisected by a straight cutting edge 12, formed at the lower end of the web 8. While the cutting edge 12 may be omitted in some instances, it is a highly desirable feature of my drill,for the reason that it prevents the accumulation of dirt or small pieces of stone behind the bit 10, which would obviously interfere with the elfective manipulation of the latter and would prevent its being swung forwithdrawal through the tube or casing of the well. and 3 of the drawings it will be seen that the stop-flange 7 in one position of the expandin g bit is seated within the recessed side of the slot 5, withits outer face flush with the 15, and its upper edge 16 is slightly inclined to permit it to abut squarely against the in- By reference to Figs. 2

clined upper en d 17 f the slot 5, which constitutes a rigid sea-t sustaining the thrust of the bit 9 to prevent the strain of the latter from being exerted upon the pintle 13 during the operation of the tool. The lower end of the slot opens into a considerably wider elongated bit-removing opening '18 of sufficient width and length to permit the removal therethrough of the bit 9, which is displaced first by the removal of the pintle 15 and then i by sliding the bit into the opening 18,which is sufficiently Wide to permit the stop-flange to be drawn laterally therethrough. The side and end walls of the opening 18 con-verge 5 somewhat to conform to the contour of a wedge-shaped key-block 19, which ordinarily g plugs the opening 18 and is retained therein by a retaining-pin 20.

The manipulation of my drill in use is as follows: Ihe 'well tube or ca'sing21 being 'of i just :sufiicient internal diameter to receive; the stock 1 and the bit 9, the latter is s wtung against the resistance of the spring- 13 to a t central position Within the stocktlrat is to say, the flange 7 and the bit 10 are disposed at like distances f rom the-ad j ac'en t-side faces of the stock. The retention of the empam sion-bit in this position maybe insured by; a binder -of twine or other like material; but this is not essential and may be omitted, if desired. The drill, retained upon the lower end of the shank 3, is, as'usual, passed through the Well tube or casing 21, and when the 'expansion-bit 9 reaches the end of the tube the '1 spring '13 will cause it to swing laterally to the dotted position sho-wnin Fig. l, the cutting; edge of'th e bit-flange '10 being located a consid-era-bledistance beyondthe wall of theitu be 5 and being effective for the reaming of ahole o-f considerably greater diarneter than the di- Q ameterof the casing. If new the retraction of the drill is desired, it is elevated to the tube in the ordinary manner and the eXpa-ndl ing or supplemental bit is swung to the posi- 1- tion indicated in :full lines in Fig. 1 bycoming into contact with the lower edge of the tool. From the forgoing it will be observed that: I-have produced asimiple, durable, andefiective drill equally adapted for well 'boring orf rock-drilling and comprehending an expanda ing bit which, while capable of being passed through the-tube, is effective for the boring or reaming of a hole of larger diameter "than the tube to facilitate the positioning of the latter; but while the present embodiment: of the invention appears at this time to-bet, preferable I wish to reserve the right to =eft fe'ct such changes, modifications, and vari'a-E tions as may be -suggested by experience and experiment or required by the various contingencies of use, so long-as such variations are embraced clearly within the spiritof the invention.

What I claim is- 1. A rock-drill comprising a stock having a longitudinal slot, and an expansion-bit piv-j oted within the slot and provided'with flanges at its opposite edges, said flanges being disposed to permit its pivotal movement but to prevent its withdrawal.

2. A rock-drill comprising a stock having a longitudinal slot, and an expansion-bit pivoted within the slot, said bit being provided at its up'pere-nd with a flat face arranged to abut against the end wall of the slot in the expanded position of the bit, and formed at its lower end with an arcuate cutting edge and a stopflange disposed at one side of the bit and located to :be seated against thestock when the bit is expanded.

3. A rock-drillcomprising a stock having a longitudinal slot, and an expansion-bit pivoted within the slot and having at its upper end :a fiat face arranged to abutcagainst the end wall-of the slot in the expanded position of the bit, said ibit being provided with a web having :a straight cutting edge formed at its lower end and a bit-flange disposedalong the longitudinal edge of the bit and terminating in the plane of the lower extremity of the web, the lower end of *said flange being formed with an arcuate cutting edge bisected by the straight cuttingedge of the web and a stopflange disposed at one side of the bit and 10- caited to be seated against the-stock when the bit is expanded, said bit-flange and stopflange being disposed at opposite edges of the bit to permit the pivotal mo-vernen'tof the bit but to prevent its withdrawal from the stock.

4. A rock-drillcomprisin-ga stock having a longitudinal slot widened at one side face of the stock, and 5a pivoted expansion-bit comprising a web located'within the slot, at stopflange along one edge of the web for reception within the widened end of the slot, and a bit-flange along the opposite edge of the web, the lower ends of said bit-flange and web being provided with cutting edges.

5. A rock-drill "comprising a stock having a cutting edge'for ned atone end and provided with aslot having an inclined end wall, an expansion -bi-t pivoted within the slot and comprisinga web having an inclined upper end arranged to abut against the inclined Wall of the slot in the expanded position of the bit and having its lower end formed with a cutting cdge, a stop-flange located along one longitudinal-edge off the bit and designed in the working :position of the latter to lie flush with the face of the stock, a bit-flange formed at the opposite edge of the web and formed at its lower end with an arcuate cutting-edge, andsa spring located upon one side of the stock and bearing against the stop flange.

6. In-a rock-drill, the combination with a stockformed with. a slot extending entirely therethrough and with a bit-removingopen ing likewise-extending through the stock and of greater'width-than said slot, a bit mounted within the slot, means preventing the lateral Withdrawal of the bit from the slot and a key-block closing the bit-ren1oving opening.

key-block located within the bit-removing opening.

In testimony that I claim the foregoing as my own I have hereto affixed my signature in the presence of two Witnesses.

JAMES FORSYTI-IE.

Witnesses:

T. B. JOHNSTON, T. H. LIGHTFOOT. 

